Splashing the pot
Also: splash the pot
Throwing chips into the middle so they mix with the pot instead of stacking them neatly in front of you. It makes the amount bet impossible to verify, and dealers stop it for exactly that reason.
Betting chips should be placed in front of the player, clearly countable, until the dealer pulls them in. A player who flings them into the pot destroys the record: nobody can now confirm whether the bet was three hundred or four, and the only remedy is to count the whole pot and reconstruct it.
The convention exists for verification, not etiquette. At its worst, splashing can be used deliberately to obscure a short bet, which is why the dealer's correction can sound sharper than the offence seems to warrant.
It pairs with the related rules on announcing an amount and on forward motion: live poker's betting conventions are all designed so that the size of a bet is never a matter of anyone's memory.
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What does splashing the pot mean?
Tossing your chips into the pot so they mix with the chips already there, instead of placing them in a countable stack in front of you.
Why is it against the rules?
Because the amount bet can no longer be verified without breaking down the entire pot. It can also be used deliberately to disguise a bet that is short.